*4.1. Materials*

The experiments were performed with mature purple flesh sweet potato (PFSP) from a farm in Haenam-gun in Korea. The samples were stored at 5 ◦C. In addition, sodium alginate (32–250 kDa, Duksan Chemicals, Ansan-si, Republic of Korea), high molecular weight chitosan (≥75% deacetylation, Sigma Aldrich, USA), calcium chloride, glacial acetic acid, and Tween-80 were obtained from Sigma Aldrich (St. Louis, MO, USA).
